Trắc nghiệm Chuyên đề 4: Reading có đáp án

(8) the waste decays in the bio-digester, it (9) two things – biogas and slurry.

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(8)                               the waste decays in the bio-digester, it (9)                             two things – biogas and slurry.

Because

Moreover

Although

As

Giải thích

Chọn đáp án D